TMR1 : 1 minute count

[alamy]

dear all.

how to have a counter that will count for 1 minute...by using TMR1 in pic16f628a
i reer to use an interrupt

previously i use delay a minute from piclist code generator.

here the code fo 1 minute delay

; Delay = 60 seconds
; Clock frequency = 4 MHz

; Actual delay = 60 seconds = 60000000 cycles
; Error = 0 %

	cblock
	d1
	d2
	d3
	endc

Delay1minute
			;59999994 cycles
	movlw	0x23
	movwf	d1
	movlw	0xCB
	movwf	d2
	movlw	0x83
	movwf	d3
Delay1minute_0
	decfsz	d1, f
	goto	$+2
	decfsz	d2, f
	goto	$+2
	decfsz	d3, f
	goto	Delay1minute_0

			;2 cycles
	goto	$+1

			;4 cycles (including call)
	return

how do i modify thsi code so that it can be use for TMR1

thanks in advance

 

[Nigel Goodwin]

how do i modify thsi code so that it can be use for TMR1

You don't, it's got nothing to do with a timer.

A timer can't give a delay anywhere near a minute, you need to set a timer (personally I find tmr2 is the best to use!) to give regular interrupts, I tend to use 10mS interrupts. The interrupt routine then increments a series of registers, giving a count of seconds, minutes, etc.